Where exactly are the heat/air blender unit and the vacuum lines?

under hood,driver side up clost to firewall.

Thank you, papa. I've read of pulling the radio and observing the 'white' box revealed behind it...I've read where someone indicated it was actually behind the firewall proper and while you could see it, you could reach up in there and feel for it. Not much help when taken in preponderance -- 3 different locations...great! lol I guess I'll try all three.

their are 3 of them start at fender up at firewall,if cracked or soft replace,their is also a 3 prong round valve the vac lines hook into,they go bad,replace that to,can be found at any parts store in the help section,pulling the radio is a waist of time,the valve behind it works off the vacume lines it never goes bad and the line that goes to it is clear plastic,which is not exposed to the elements such as heat, moisture,if you were to see it ,it would still look new.